Physics
Scientific paper
Nov 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970p%26ss...18.1535s&link_type=abstract
Planetary and Space Science, Volume 18, Issue 11, p. 1535-1550.
Physics
7
Scientific paper
We have evaluated the transport coefficients of the ionospheric electron gas-thermal conductivity, electrical conductivity, current flow conductivity due to thermal gradients, and heat flow conductivity due to electric fields. Shkarofsky's formulation has been used, making it possible to allow rigorously for the velocity dependence of electron-electron, electron-ion, and electron-neutral collision frequencies. This has permitted us to calculate the transport coefficients at all altitudes from the weakly-ionized limit at 100 km to the fully-ionized limit at 600 km. In this way we confirm the accuracy of an expression for the thermal conductivity in the ionosphere derived by Banks, but we find an error in the expression for the electrical conductivity which has been used in some ionospheric studies. We explore possible thermoelectric effects on ionospheric electron temperatures and conclude that temperatures are significantly affected by field-aligned currents of about 10-5 amp m-2, such as appear to flow in the auroral oval.
Schunk Robert W.
Walker James C. G.
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